Table 1 Parameters of LED display and how they match the ISCEV standard.
ISCEV standard | LED stimulator | Comply | |
|---|---|---|---|
Stimulus type | Pattern reversal | Pattern reversal | OK |
Field size (minimum) | 15° | 6° × 24° resp 3° × 12° | X |
Presentation | Monocular | Monocular | OK |
Stimulus: check widths | 0.25° resp 1° | 0.25° resp. 0.5° | OK resp X |
Mean luminance (Cd/m2) | 50 (40–60) | 50 | OK |
Michaelson contrast (%) | ≥ 80 | 100 | OK |
Presentation rate (rev/s) | 2 | 2 | OK |
Viewing distance (cm) | 50–150 | 58 resp. 116 | OK |
Checks shape | Square | Square | OK |
Number of light/dark checks | Equal | Equal | OK |
Aspect ratio width/ height | Max 4:3 | 1:4 | X |
Narrowest dimension of field | Min 15° | 6° resp. 3° | X |
Fixation point | At corners | At corners | OK |
Transient luminance change | No | No | OK |
